Concrete breaker

ABSTRACT

A body having a working end is secured at its opposite end to a coupling for engagement to a mobile hammer or the like. The working end is provided with three spaced, hexagonal breaking bars. Two of the bars are positioned at opposite edges of the working end, whereas the third bar is centrally positioned between them. The central bar extends outwardly from the other two bars a substantial distance so that it contacts the concrete or the like before the other two bars.

United States Patent Mottinger 1 July 1 1, 1972 s41 CONCRETE BREAKER302,958 8/1884 Stutz ..299/69 x Inventor: Amhie Motfinser, 0 MarineDrive, FOREIGN PATENTS OR APPLICATIONS Bremerton, Wash. 98310 8,92412/1852 France ..299/69 [22] Filed: Aug. 10, 1970 21 A L N 62 73 PrimaryExaminer-Ernest R. Purser I pp 0 Attorney-Seed, Berry & Dowrey [52] US.Cl 299/88, 299/94 [57] ABSTRACT [51] Int. Cl. 1 35/18 58] Field ofSearch 299/37 38 69 7o 88 94 A body having a working end is secured atits opposite end to a coupling for engagement to a mobile hammer or thelike. The 56] References Cited working end is provided with threespaced, hexagonal breaking bars. Two of the bars are positioned atopposite edges of UNITED STATES PATENTS the working end, whereas thethird bar is centrally positioned between them. The central bar extendsoutwardly from the 1,704,865 1929 P x other two bars a substantialdistance so that it contacts the 3,276,820 10/1966 Dllson concrete orthe like before the other two bars.

894,269 7/1908 Hendron.. ....299/37 1,830,751 11/1931 Cornett ..299/375-Clalms, 4 Drawing Figures PATENTEDJUL n 1912, 3. 675 973 INVENTOR.ARCHIE MOTTINGER ATTORNEYS CONCRETE BREAKER BACKGROUND OF THE INVENTIONbar having a large circular cross section. In general, both the.

rectangular and circular breaker presented too large a working surfacecausing the surface worked on to break along an irregular line and oftenbreaking-off portions of the surface desired to be left intact. Inaddition a large force was required to drive the breaker through thesurface and much noise was created.

SUMMARY OF THE INVENTION It is an object of this invention to provide aconcrete breaker which breaks the surface, such as asphalt, curbstone,concrete or the like, along a relatively even line.

Another object is to provide a breaker which requires less driving forceto penetrate the surface. The reduction in the driving force, of course,allows the use of smaller mobile hammers and less strain on thosehammers used. It additionally reduces the noise and vibration levelspresent during the breaking operation.

The preferred breaker of this invention comprises a body eitherintegrally formed with a coupling end and a working end or in the formof an adapter body to fit over a conventional rectangular breaking toolwhich tool will then comprise the coupling end of the body. The workingend is provided with at least three breaking bars, the centermost barbeing substantially longer than the others.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an isometric of a breakeremploying the principles of the invention.

FIG. 2 is a side elevation of the breaker shown in FIG. 1.

FIG. 3 is an end elevation of the breaker shown in FIG. 1.

FIG. 4 is a bottom plan of the breaker shown in FIG. 1.

DESCRIPTION OF THE PREFERRED EMBODIMENT The concrete breaker of thisinvention comprises a body 12 preferably in the form of a rectangularshell having a lower working end 14. The shell is fitted and welded to aconventional rectangular breaking tool 16 which for the purposes of thisdescription will be termed a coupling end." The coupling end 16 isprovided with openings 18 for securing to a conventional mobile hammeror the like. The body 12 may, of course,

be solid and integrally formed with the coupling end.

The working end 14 is provided with three breaking bars 20, 21, and 22.The breaking bars 20 and 22 are positioned adjacent the lateral edges ofthe working end. The breaking bar 21 is positioned centrally of the bars20 and 22 and, as best shown in FIG. 2, is of a substantially greaterlength than the others. All of the bars are, in the preferred form,welded to the working end by weldments 24. All of the breaking bars arepreferably of hexagonal transverse cross-section, although other shapesmay be employed.

The purpose of having a longer central bar 21 is to assure that thecentral bar is the first to contact the concrete or other surface to bebroken. As a result, the central bar penetrates the surface producing ahole which weakens the surface outwardly thereof. This weakened surfaceis then contacted by the two spaced bars 20 and 22 which complete thebreaking of the portion of the concrete along the line between the threerods. The break thus produced occurs along a relatively smooth line. Theworking end also defines opposite cutting edges 26, one of which followsthe bars through the break knocking off any remaining ja ed edges.

While the preferred form 0 my invention has been illustrated anddescribed it should be understood that variations will be apparent toone skilled in the art. Accordingly, it is intended that the inventionnot be limited to the specific form illustrated but that the claimsappended hereto be given the broadest interpretation possible.

The embodiments of the invention in which an exclusive property orprivilege is claimed are defined as follows:

1. A breaker for concrete or the like comprising a body having acoupling end and a working end spaced along a longitudinal planethereof, at least three spaced breaking bars secured to said working endand extending outwardly generally along said longitudinal plane, saidbars each having a blunt terminal end, at least one of said bars beingpositioned between two outer bars and being of a substantially greaterlength than said two outer bars.

2. The breaker of claim 1 wherein said bars are integral with said body.

3. The breaker of claim 1 wherein said bars are hexagonal in transversecross-section.

4. The breaker of claim 1 wherein said two outer bars are positionedgenerally at the opposite edges of said working end and said bar ofgreater length is centrally positioned between said two outer bars.

5. The breaker of claim 1 wherein said body comprises a rectangularshell and wherein said coupling end comprises a conventional rectangularbreaking tool inserted within said shell and welded thereto whereby saidbody, working end, and breaking bars form an adapter for insertion oversaid coupling end.

1. A breaker for concrete or the like comprising a body having acoupling end and a working end spaced along a longitudinal planethereof, at least three spaced breaking bars secured to said working endand extending outwardly generally along said longitudinal plane, saidbars each having a blunt terminal end, at least one of said bars beingpositioned between two outer bars and being of a substantially greaterlength than said two outer bars.
 2. The breaker of claim 1 wherein saidbars are integral with said body.
 3. The breaker of claim 1 wherein saidbars are hexagonal in transverse cross-section.
 4. The breaker of claim1 wherein said two outer bars are positioned generally at the oppositeedges of said working end and said bar of greater length is centrallypositioned between said two outer bars.
 5. The breaker of claim 1wherein said body comprises a rectangular shell and wherein saidcoupling end comprises a conventional rectangular breaking tool insertedwithin said shell and welded thereto whereby said body, working end, andbreaking bars form an adapter for insertion over said coupling end.